LBA120L

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Solid State Relays (SSRs) are becoming increasingly important in industrial applications due to the increased reliability and robustness they offer compared to more traditional electromagnetic relays. The LBA120L is one such example of a solid state relay, specifically designed for high inrush current applications. This article will discuss its application fields and working principles.

Overview of the LBA120L

Designed for use in harsh conditions, the LBA120L solid state relay is a surface mount device (SMD) with a peak breakdown voltage of 1200V and an overload current of 20A for 24/48V DC and 10A for 120/240V AC supply. It has a minimum switching frequency of 200Hz and a maximum operating temperature range of -55°C to 125°C. The LBA120L uses an industry-standard mounting pattern, allowing it to be easily mounted on various substrates or with any industry-standard SIP relay sockets. It also features internal power supply isolation protection and is pre-tested to ensure its high reliability.

Application Fields

The LBA120L has many potential applications, including temperature and humidity control, voltage and current control, process control, motor control, and lightning protection. It is particularly suitable for applications that require a high inrush current capability, such as in electric vehicle chargers, power supplies, motors, and relays. Additionally, it is highly resistant to dust, vibration, and shock, making it suitable for use in harsh environments. As such, it can be used in a range of industries, such as automotive, telecommunications, industrial, lighting, and robotics.

Working Principle

The LBA120L works on a simple principle; it turns on and off power to its load by using a control signal from superimposed parameters. In operation,the LBA120L solid state relay relies on three main components: the control circuit,the output circuit, and the switching element.

The control circuit is composed of an opto-isolator, and an electro-mechanical timing circuit. The opto-isolator then provides isolation between the logic circuit and the load. The electro-mechanical timing circuit controls the Turn-ON and Turn-OFF times of the LBA120L SSR. The output circuit is composed of a power MOSFET which is connected between the load and the power supply. The switching element, finally, is the opto-isolator which initiates the switching operation.

Essentially, when power is applied to the LBA120L, current flows through the opto-isolator in the control circuit, causing the gate of the power MOSFET to turn-on. This results in current flow through the output circuit, energizing the load. This action is repeated each time a logic signal is sent to the relay, with the Turn-ON and Turn-OFF times being set by the electro-mechanical timing circuit. This type of switching is efficient, provides fast transient response, and is more robust than traditional electromagnetic relays.

Conclusion

The LBA120L solid state relay is a suitable choice for industrial applications due to its reliable and robust operation. It can be used in a wide range of applications, from temperature and humidity control to voltage and current control and motor control. Furthermore, its working principle is simple and efficient, with the control circuit, the output circuit, and the switching element all working together to ensure fast and reliable operation. As a result, the LBA120L is capable of providing reliable operation even in harsh environments.

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